Mo. Rev. Stat. § 491.725
2. As used in this section, the following terms shall mean:
(1) "Child", a person fourteen years of age or under, or at the discretion of the court, a person fifteen to seventeen years of age, who is a witness in any judicial proceeding under chapter 452 or 453, or the alleged victim or witness in any judicial proceeding under chapter 455, 565, 566, or 568. The court shall make written findings on the record when a child fifteen to seventeen years of age is included under this subdivision. "Victim" or "witness" shall not include any child accused of committing a felony; however, these terms may, in the court's discretion, include:
3. In order to facilitate testimony that is fair and accurate, for the benefit of all parties, and in order to protect all parties from the risks of a child becoming confused while testifying in a judicial proceeding, the following child witness protection act shall apply to all children testifying in court:
(4) Upon motion made by the child, his or her representative, or any party to the judicial proceeding, at least thirty days in advance of the judicial proceeding, the court may allow the child to have a toy, blanket, or similar item in his or her possession while testifying, but such item shall only be allowed if:
(b) If the movant shows the court by a preponderance of evidence that:
(5) Upon motion made by the child, his or her representative, or any party to the judicial proceeding, at least thirty days in advance of the judicial proceeding, the court may designate a support person, who shall be present in the courtroom, in view of the child witness. The court may allow the support person to remain in close proximity to the child during the child's testimony, but such action shall only be allowed if:
(b) If the movant shows the court by a preponderance of the evidence that:
(7) Upon its own motion or the motion of any party to the judicial proceeding, at least thirty days in advance of the judicial proceeding, the court may order such accommodations as are appropriate under the circumstances to ensure the comfort of the child victim or witness, including the following measures:
(L. 2009 H.B. 863)